API: preprocessing.imputation

skyulf.preprocessing.imputation

Imputation nodes package.

Split from a single 416-LOC module into per-imputer files

_common.py — shared helpers (column resolution, polars fill values, sklearn transform) simple.py — SimpleImputer knn.py — KNNImputer iterative.py — IterativeImputer (MICE)

All public names are re-exported here so existing imports such as from skyulf.preprocessing.imputation import SimpleImputerCalculator continue to work unchanged.